mtd: core: Drop duplicate NULL checks around nvmem_unregister()

Since nvmem_unregister() checks for NULL, no need to repeat in
the caller. Drop duplicate NULL checks.

Acked-by: Miquel Raynal <[e-mail]>
Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Srinivas Kandagatla <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/mtd/mtdcore.c

···
 		debugfs_remove_recursive(mtd->dbg.dfs_dir);
 
 		/* Try to remove the NVMEM provider */
-		if (mtd->nvmem)
-			nvmem_unregister(mtd->nvmem);
+		nvmem_unregister(mtd->nvmem);
 
 		device_unregister(&mtd->dev);
 
···
 	return 0;
 
 err:
-	if (mtd->otp_user_nvmem)
-		nvmem_unregister(mtd->otp_user_nvmem);
+	nvmem_unregister(mtd->otp_user_nvmem);
 	return err;
 }
 
···
 		memset(&master->reboot_notifier, 0, sizeof(master->reboot_notifier));
 	}
 
-	if (master->otp_user_nvmem)
-		nvmem_unregister(master->otp_user_nvmem);
-
-	if (master->otp_factory_nvmem)
-		nvmem_unregister(master->otp_factory_nvmem);
+	nvmem_unregister(master->otp_user_nvmem);
+	nvmem_unregister(master->otp_factory_nvmem);
 
 	err = del_mtd_partitions(master);
 	if (err)